of Anjou, with the support of the Church, led an army against the Kingdom. They fought at Benevento, just to the north of the Kingdom's border. Manfred was killed in battle and Charles was crowned King of Sicily by Pope Clement IV. Growing opposition to French officialdom and high taxation led to an insurrection in 1282 (the Sicilian Vespers), which was successful with the support of Peter III of Aragón, who was crowned King of Sicily by the island's barons. Peter III had previously married Manfred's daughter, Constance, and it was for this reason that the Sicilian barons effectively invited him. This victory split the Kingdom in two, with Charles continuing to rule the mainland part (still known as the Kingdom of Sicily as well). The ensuing War of the Sicilian Vespers lasted until the peace of Caltabellotta in 1302, although it was to continue on and off for a period of 90 years. With two kings both claiming to be the King of Sicily, the separate island kingdom became known as the Kingdom of Trinacria. It is this split that ultimately led to the creation of the Kingdom of the Two Sicilies some 500 years on. Aragonese period Peter III's son, Frederick III of Sicily (also known as Frederick II of Sicily) reigned from 1298 to 1337. For the whole of the 14th century, Sicily was essentially an independent kingdom, ruled by relatives of the kings of Aragon, but for all intents and purposes they were Sicilian kings. The Sicilian parliament, already in existence for a century, continued to function with wide powers and responsibilities. During this period, a sense of a Sicilian people and nation emerged, that is to say, the population was no longer divided between Greek, Arab and Latin peoples. Catalan and Aragonese were the languages of the royal court, and Sicilian was the language of the parliament and the general citizenry. These circumstances continued until 1409 when because of failure of the Sicilian line of the Aragonese dynasty, the Sicilian throne became part of the Crown of Aragon. The island's first university was founded at Catania in 1434. Antonello da Messina is Sicily's greatest artist from this period. Spanish period With the union of the crowns of Castile and Aragon in 1479, Sicily was ruled directly by the kings of Spain via governors and viceroys. In the ensuing centuries, authority on the island was to